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Extended Broadband SLD Light Source
(Fiber Patch Cables Not Included)
Thorlabs has partnered with Praevium Research to develop the LS2000C Extended Bandwidth SLD Light Source. In OCT imaging systems, the optical bandwidth of the light source is inversely proportional to the axial resolution. To provide higher axial resolution than currently possible with a single SLD, this source combines the output of a matched pair of SLDs to provide a single light source with an extended bandwidth ideal for high resolution OCT imaging applications.
The matched-pair SLDs have offset emission spectra, selected such that their combined output provides broadband emission with peak-to-valley intensity differences of less than 3 dB, as illustrated in the Channel A+B spectrum below.
The source offers three FC/APC fiber connectors on the front panel of the LS2000C. The first two channels provide access to the output of the two independent SLDs, while the third channel provides extended bandwidth output by combining the output of the two SLDs. The combined channel has a bandwidth of >170 nm and output power greater than 10 mW from each channel. Channels A and B can operate simultaneously, while Channel A+B must be run independently of the others.
The LS2000C Extended Broadband SLD Light Source packages the matched-pair SLDs into a single compact housing. Like our other 1300 nm SLD for OCT, these SLDs have an integrated isolator, thermistor, and TEC element for optimal performance. The LS2000C front panel provides independent control of the output of each SLD. Additionally, the front panel of the unit has an enable/disable output button for each SLD as well as a reset button to return the device to the factory presets.
The LS2000C SLD light source can be completely controlled using either the front panel interface or through a PC via the USB connection on the back of the unit. When using the USB interface, the source can be controlled with the provided software as well as through command line language.
OCT Scan of an Onion Skin
This extended light source can be used in OCT imaging systems to produce images with a resolution of ~3 μm in biological (n = 1.33) samples. The images below demonstrate the increased resolution obtained when the light source is switched from a 90 nm bandwidth single SLD source to a 200 nm extended bandwidth SLD source.
Image Taken Using a 90 nm Bandwidth SLD
Image Taken Using a 200 nm Extended Bandwidth SLD
OCT Imaging with a 90 nm bandwidth (FWHM) source provides ~9 μm of axial resolution, as demonstrated in the top image of an onion skin. Incorporating an extended broadband SLD, based on matched-pair SLD light sources that together provide a bandwidth of 200 nm (typical, FWHM), enables imaging at axial resolutions less than 4 μm, as demonstrated above. The higher resolution provided by the extended broadband SLD enables visualization of distinct layers in the onion skin.
USB Type B
USB Type B to Type A Cable Included